Roscoe, Snyder & Pacific 4-6-0 "Ten-wheeler" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class 2 (Locobase 13315)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 32, p. 24. See also William R. Hunt, "ROSCOE, SNYDER AND PACIFIC RAILWAY," Handbook of Texas Online (http://www.tshaonline.org/handbook/online/articles/eqr13), accessed October 28, 2011. Published by the Texas State Historical Association.. Works number was 33128 in January 1909.

Just a few miles west of Sweetwater (savory name, that) lay the RS&P, chartered in 1906 to build about 200 miles of line from Roscoe northwest through Bailey County. The first 31 miles (49.9 km) from Roscoe to Snyder was laid down quickly enough and the line opened in July 1908. The Ten-wheeler shown in this entry would have operated on this segment first.

Although it was a typical short line 4-6-0, its Baldwin spec sheet has two "Hereafter" notes that indicate how individual was each order. Should the RS&P order another Baldwin (it didn't), the builder was to "make the back cab window on side 8" longer and shorten the front side window to suit." (The shops might already have modified the 2 accordingly.) Also, "make valve rod guide of cast iron with brass bushing."

In September 1909, the next 18 1/2 miles (29.8 km) opened to Fluvanna.

Even though those 49 1/2 miles (79.7 km) would be all there ever was of the RS & P, it was, says Hunt's article in the Handbook of Texas, "one of the most profitable short lines in the nation" because of its strategic location as a bridge line.

By 1941, however, the Fluvanna extension was abandoned and taken up. Passenger service on the rest ended in 1953. The line itself closed in 1984.


Class 3 (Locobase 14342)

Data from Baldwin Locomotive Works Specification for Engines, 1903, as digitized by the DeGolyer Library of Southern Methodist University, Vol 53, pp. 339+. Works number was 44060 in September 1916.

Locobase 13174 shows the RS&P's saturated-boiler mixed-service Ten-wheeler that arrived from Baldwin in 1909. The 3 was a reworking of that design to take advantage of drier steam provided by a superheater. To make room for the 20 flues full of elements, the boiler sacrificed 119 small tubes and about 10% of combined heating surface area. Hotter steam meant adoption of 9 1/2" (241 mm) piston valves in place of the 2's slide valves.

A photo on the Denver Public Library's Digital Collections (http://digital.denverlibrary.org/cdm/singleitem/collection/p15330coll22/id/77161/rec/1329) shows a trim-looking #3 still at work for the RS&P in 1947.

Specifications by Steve Llanso of Sweat House Media
Class23
Locobase ID13,315 14,342
RailroadRoscoe, Snyder & PacificRoscoe, Snyder & Pacific
CountryUSAUSA
Whyte4-6-04-6-0
Number in Class11
Road Numbers23
GaugeStdStd
Number Built11
BuilderBurnham, Williams & CoBaldwin
Year19091916
Valve GearStephensonWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft)11.3311.33
Engine Wheelbase (ft)21.5821.58
Ratio of driving wheelbase to overall engine wheebase 0.53 0.53
Overall Wheelbase (engine & tender) (ft)51.96511.70
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)97,00098,000
Engine Weight (lbs)122,000126,000
Tender Loaded Weight (lbs)100,000100,000
Total Engine and Tender Weight (lbs)222,000226,000
Tender Water Capacity (gals)50005000
Tender Fuel Capacity (oil/coal) (gals/tons)1010
Minimum weight of rail (calculated) (lb/yd)5454
Geometry Relating to Tractive Effort
Driver Diameter (in)5857
Boiler Pressure (psi)190190
High Pressure Cylinders (dia x stroke) (in)18" x 24"18" x 24"
Tractive Effort (lbs)21,65222,032
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.48 4.45
Heating Ability
Firebox Area (sq ft)145108
Grate Area (sq ft)22.2022.30
Evaporative Heating Surface (sq ft)17961335
Superheating Surface (sq ft)299
Combined Heating Surface (sq ft)17961634
Evaporative Heating Surface/Cylinder Volume254.08188.86
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation42184237
Same as above plus superheater percentage42185000
Same as above but substitute firebox area for grate area27,55024,214
Power L1655011,660
Power MT446.61786.91


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